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About ARS

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    Irregular Spirits

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    fully independent AIs

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  1. It's a joke on nuclear bomb disarming scene on movie Armageddon
  2. In movies, Time Bomb, no matter who made it or what it's original purpose, whether it's a jury-rigged bomb made by terrorist in a garage to blow up a city block or a nuclear bomb made by NASA to destroy asteroid by splitting it in two, there's bound to be a scene of 'Wire dillema' (aka the classic red or green wire to cut?), now I'm not going to ask about the wire color problem, as any self-conscious bomb maker would definitely made it harder to defuse. What I want to ask is, does this mechanism really exist in real-life bombs? A bomb mechanism where at the end of it, there's 2 wires that when
  3. In a lot of sci-fi movies involving brain-machine interface, there's a concept where the memories of recently dead person can be viewed by doing whatever the tech the movie has (such as the one in 'The 6th Day' and 'GI Joe Rise of The Cobra'). Now, if a person die, does the brain (which works using electrical impulses) still have memories of the deceased person even after the electrical activity has ceased entirely? Like how a harddrive that stores the data of a computer (alive) is being plugged out of the system (dead) still retains it even without power? I'm not talking about the tech to vie
  4. Happy 60 years anniversary of Yuri's flight!
  5. Bullets have effective range (the longest range it has enough kinetic energy and still reliably do damage) and max range (the longest range it travels). We're assuming that this value is based on shooting level horizontally, and the values might change depending on the angle of the gun fired. In any case, air resistance will eventually slow down the bullet and gravity will pull it downward, decreasing it's kinetic energy the longer it travels. But what about this? Let's assume that a gun has effective range of 200m and max range of 300m (at level firing), but what if we fire it straight downwa
  6. Frequently, in space sci-fi, we can see ships (whether small or large) that's asymmetrical in shape (that is, the port and starboard side are drastically different in shape, which in turn makes one side heavier than other), mostly this is a mobile space station or space colonies, with more thrusters placed at the smaller side to compensate the thrust from engines placed on the other side. From engineering perspective, especially in spaceflight, should the spaceship being better designed as symmetrical or should the asymmetrical design be avoided as possible? I know that the aerodynamic doesn't
  7. Wait, so those SPAAG are not actually engaging the airborne target with their own targeting, but actually being 'directed' by other vehicle that provides targeting data?
  8. Does the radar on SPAAG (those spinning bits on top) works on area with a lot of overhead obstacle like those in the middle of a city where tall buildings are around it or in the forested area where there are a lot of large trees? Or is it only usable on large open areas?
  9. If a craft is flying very fast in atmosphere, it experiences atmospheric drag and excessive heating, in addition to causing a sonic boom effect. Is there any equivalent for it in underwater scenario? I know that there's a supercavitation effect that allows torpedoes to travel at highspeed underwater, but does the effect is the same like in the air, such as the underwater equivalent of sonic boom? Does being underwater mitigates the heating caused by drag or it does nothing?
  10. Because other nations knows how to do asparagus staging
  11. Does a cartoonish cone-shaped drill actually makes sense or practical to be used to dig through earth? Because as far as I know, no drill in real life looks like that, it's either long, spiralling drill or a massive flat-headed tunneling cylinder with crushing teeth lining up the front part
  12. So... Today, I revisit my old collection of games for nostalgia. Among those are Call of Duty Modern Warfare 2 (2009 one, not the 2020 remaster). While playing it, something strikes my curiosity: In 2 consecutive mission (Contingency and Second Sun), a nuclear missile was launched from submarine base in Russia towards US east coast before detonating at high altitude to create EMP effect that cripples Russian troops on US soil. The one that interest me is the missile itself. Judging from what I've seen in-game: 1. Contingency started at August 14th, 2016 at 11:22:34. Assuming a normal play
  13. Is there any reason why firearms magazine has particular shape? (I'm talking specifically about the regular 30-rounds magazines, not drums) There are magazines that's curved forward (M4 or AK), straight (FAL or G3) and swept backward (Vector). Is there any reason for the shape or it's just for aesthetic purpose? Considering all of them do the same thing: Push the bullets inside upwards
  14. When long-duration space mission using probes are conducted (which can take years, such as Dawn mission). After setting the flight and orbit parameter of the probes' autopilot (when to do burn, how long the burn is conducted, craft orientation, hibernation mode, etc.), when the probes are on escape trajectory from earth's gravity well, does the mission control keep tracking the probe everyday for years until it reached the point for flight maneuver adjustment (such as when entering another celestial body's gravity well for gravity assist, maneuvering for rendezvous, etc.), or just do like what
  15. Why the design for reentry vehicle is always smooth-curved (like the underside of space shuttle or the design of Apollo/ Soyuz capsule). What if the reentry capsule/ vehicle design itself is viable for reentry but with highly angular design? (aka, same design, but all smooth and curved part is turned into blocky angular), compare Apollo/ Soyuz capsule with WH40k space marine drop pods
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